package com.feng.picture.service.impl;

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.feng.picture.constant.UserConstant;
import com.feng.picture.exception.BusinessException;
import com.feng.picture.exception.ErrorCode;
import com.feng.picture.pojo.dto.user.UserQueryRequest;
import com.feng.picture.pojo.entity.User;
import com.feng.picture.pojo.enums.UserRoleEnum;
import com.feng.picture.pojo.vo.LoginUserVO;
import com.feng.picture.pojo.vo.UserVO;
import com.feng.picture.service.UserService;
import com.feng.picture.mapper.UserMapper;
import jakarta.annotation.Resource;
import jakarta.servlet.http.HttpServletRequest;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.util.List;
import java.util.stream.Collectors;

/**
* @author Liquor
* @description 针对表【user(用户)】的数据库操作Service实现
* @createDate 2025-08-21 11:26:40
*/
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
    implements UserService{

    @Resource
    private UserMapper userMapper;

    /**
     * 用户注册
     * @param userAccount 用户账号
     * @param userPassword 用户密码
     * @param checkPassword 确认密码
     * @return 账号的id
     */
    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {
        // 1. 校验参数
        if (StringUtils.isAnyBlank(userAccount, userPassword, checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4){
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        if (userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        if (!checkPassword.equals(userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次输入密码不一致");
        }

        // 2. 检查用户账号是否与数据库中已有的重复
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        long count = this.count(queryWrapper);
        if (count > 0) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号重复");
        }

        // 3. 密码一定要加密
        String encryptPassword = getEncryptPassword(userPassword);

        // 4. 插入数据到数据库中
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("默认用户");
        user.setUserRole(UserConstant.DEFAULT_ROLE);
        boolean result = this.save(user);
        if (!result) {
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败，数据库错误");
        }
        return user.getId();
    }

    /**
     * 用户登录
     * @param userAccount 用户账号
     * @param userPassword 用户密码
     * @return 脱敏用户信息
     */
    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        // 1. 校验
        if (StringUtils.isAnyBlank(userAccount, userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4 || userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号或密码错误");
        }

        // 2. 加密
        String encryptPassword = getEncryptPassword(userPassword);

        // 3. 查询用户是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        queryWrapper.eq("userPassword", encryptPassword);
        User user = userMapper.selectOne(queryWrapper);
        if (user == null) {
            log.info("user login failed, userAccount cannot match userPassword");
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在或密码错误");
        }

        // 4. 记录用户的登录态
        request.getSession().setAttribute(UserConstant.USER_LOGIN_STATUS, user);

        // 5. 用户信息脱敏
        return getLoginUserVO(user);
    }

    /**
     * 获取当前登录用户
     * @param request 请求
     * @return 当前用户
     */
    @Override
    public User getLoginUser(HttpServletRequest request) {
        User currentUser = (User) request.getSession().getAttribute(UserConstant.USER_LOGIN_STATUS);
        if (currentUser == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR, "未登录");
        }

        // 从数据库中再次查询确保信息是最新状态（追求性能可以直接返回上述结果）
        Long id = currentUser.getId();
        currentUser = this.getById(id);
        if (currentUser == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR, "账号异常");
        }
        return currentUser;
    }

    /**
     * 退出登录
     * @param request 请求
     * @return 是否退出成功
     */
    @Override
    public boolean userLogout(HttpServletRequest request) {
        Object object = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATUS);
        if (object == null) {
            throw new BusinessException(ErrorCode.OPERATION_ERROR, "未登录");
        }
        request.getSession().removeAttribute(UserConstant.USER_LOGIN_STATUS);
        return true;
    }

    /**
     * 加密
     * @param userPassword 用户密码
     * @return 加密之后的密码
     */
    @Override
    public String getEncryptPassword(String userPassword) {
        // 盐值，混淆密码
        return DigestUtils.md5DigestAsHex((UserConstant.SALT + userPassword).getBytes());
    }

    /**
     * 登录用户信息脱敏
     * @param user 用户完整信息
     * @return 脱敏信息
     */
    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if (user == null) {
            return null;
        }
        LoginUserVO loginUserVO = new LoginUserVO();
        BeanUtils.copyProperties(user, loginUserVO);
        return loginUserVO;
    }

    /**
     * 用户信息脱敏
     * @param user 用户完整信息
     * @return 脱敏信息
     */
    @Override
    public UserVO getUserVO(User user) {
        if (user == null) {
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtils.copyProperties(user, userVO);
        return userVO;
    }

    /**
     * 用户信息脱敏（列表）
     * @param userList 用户列表
     * @return 脱敏信息（列表）
     */
    @Override
    public List<UserVO> getUserVOList(List<User> userList) {
        if (CollUtil.isEmpty(userList)) {
            return List.of();
        }
       return userList.stream().map(this::getUserVO).collect(Collectors.toList());
    }

    /**
     * 构造比较器对象
     * @param userQueryRequest 用户查询请求
     * @return 比较器对象
     */
    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        // 构造比较器
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq(ObjUtil.isNotNull(id), "id", id);
        queryWrapper.eq(StrUtil.isNotBlank(userRole), "userRole", userRole);
        queryWrapper.like(StrUtil.isNotBlank(userAccount), "userAccount", userAccount);
        queryWrapper.like(StrUtil.isNotBlank(userName), "userName", userName);
        queryWrapper.like(StrUtil.isNotBlank(userProfile), "userProfile", userProfile);
        queryWrapper.orderBy(StrUtil.isNotEmpty(sortField), sortOrder.equals("ascend"), sortField);
        return queryWrapper;
    }

    /**
     * 判断是否为管理员
     * @param user 当前用户
     * @return 是否为管理员
     */
    @Override
    public boolean isAdmin(User user) {
        return user != null && UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }




}




